Set the default number of consumers to the number of CPUs in the system

[JulienPeloton]

IMPORTANT: Please create an issue first before opening a Pull Request.
Linked to issue(s): #184

What changes were proposed in this pull request?

By default, the datatransfer client will use all (logical) CPUs in the system when polling. The argument -nconsumers can be used to tune the number of consumer to use.

How was this patch tested?

Manually

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (29aeb3d) 71.69% compared to head (2d172c4) 71.69%.

❗ Current head 2d172c4 differs from pull request most recent head 0d1f93e. Consider uploading reports for the commit 0d1f93e to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #185   +/-   ##
=======================================
  Coverage   71.69%   71.69%           
=======================================
  Files           7        7           
  Lines         371      371           
=======================================
  Hits          266      266           
  Misses        105      105           

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[sonarqubecloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication

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